公开(公告)号：US07072143B2

公开(公告)日：2006-07-04

申请号：US10285523

申请日：2002-11-01

申请人： Masanosuke Kunikata ,  Masaki Suzuki ,  Hiroaki Takano

发明人： Masanosuke Kunikata ,  Masaki Suzuki ,  Hiroaki Takano

IPC分类号： G11B23/02

CPC分类号： G11B23/037 ,  G11B5/70 ,  G11B5/78 ,  G11B15/66

摘要： A normal tape reel is disclosed, comprising a tape reel portion and a magnetic tape wound on the reel core of the tape reel portion, wherein the ratio of the winding radius R of the magnetic tape to the radius r of the reel core (R/r) is not smaller than 3.5 and the winding hardness of the magnetic tape is adjusted to a range of from 1.9 to 11.5 N.

公开(公告)号：US06759150B2

公开(公告)日：2004-07-06

申请号：US10024993

申请日：2001-12-18

申请人： Masaki Suzuki ,  Hiroaki Takano ,  Masanosuke Kunikata

发明人： Masaki Suzuki ,  Hiroaki Takano ,  Masanosuke Kunikata

IPC分类号： G11B568

CPC分类号： G11B5/7021 ,  G11B5/70621 ,  G11B5/738

摘要： A magnetic recording medium includes: a non-magnetic support; a lower non-magnetic layer; and a magnetic layer containing a ferromagnetic powder and a binder, in this order, wherein the magnetic layer has a coercive force of 2,500 to 3,500 oersted (197.5 to 276.5 kA/m), and a squareness ratio of 0.70 to 0.85 in a length direction thereof, and the binder in the magnetic layer is a urethane resin having a glass transition temperature Tg of 70° C. or higher.

摘要翻译： 磁记录介质包括：非磁性载体; 较低的非磁性层; 以及含有铁磁性粉末和粘合剂的磁性层，其中磁性层的矫顽力为2500〜3,500奥斯特（197.5〜276.5kA / m），长度方向的矩形比为0.70〜0.85 并且磁性层中的粘合剂是玻璃化转变温度Tg为70℃以上的聚氨酯树脂。

公开(公告)号：US06686022B2

公开(公告)日：2004-02-03

申请号：US09990610

申请日：2001-11-21

申请人： Hiroaki Takano ,  Masaki Suzuki ,  Masanosuke Kunikata

发明人： Hiroaki Takano ,  Masaki Suzuki ,  Masanosuke Kunikata

IPC分类号： G11B5708

CPC分类号： G11B5/70678 ,  G11B5/7085 ,  Y10T428/24975 ,  Y10T428/25 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265

摘要： Provided is a particulate magnetic recording medium with good output at high frequency, yielding a low coefficient of friction, and having good running properties, in particular, a magnetic recording medium affording good electromagnetic characteristics and good repeat durability in recording and reproducing at a high-density. The magnetic recording medium comprises a lower layer comprising a nonmagnetic powder and a binder and an upper magnetic layer comprising a ferromagnetic powder, a binder and at least one abrasives provided on a nonmagnetic support in this order. The number of abrasive particles present on said magnetic layer surface satisfied the relation 0.2≦X≦1.2 (particles/&mgr;m2). When the number of pairs of abrasive particles satisfying the relation L≦2K (where K denotes the mean particle diameter of the abrasive and L denotes the distance from the center of gravity of one of the abrasive particles to the center of gravity of the other abrasive particle) is denoted as Y (particles/&mgr;m2), Y/X is equal to or less than 2.

摘要翻译： 本发明提供一种具有良好的高频输出的微粒磁记录介质，产生低摩擦系数，并且具有良好的运行特性，特别是在高速记录和再现时具有良好的电磁特性和良好的重复耐久性的磁记录介质， 密度。 磁记录介质包括下层，其包含非磁性粉末和粘合剂，以及上层磁性层，其包含铁磁性粉末，粘合剂和至少一种按照这种顺序设置在非磁性载体上的研磨剂。 存在于所述磁性层表面上的磨料颗粒的数量满足关系0.2 <= X <= 1.2（颗粒/母体2）。 当满足关系L <= 2K（其中K表示研磨剂的平均粒径）和L表示从研磨颗粒之一的重心到另一个的重心的距离的磨粒的数目 磨料颗粒）表示为Y（颗粒/ mum 2），Y / X等于或小于2。

公开(公告)号：US5876833A

公开(公告)日：1999-03-02

申请号：US956796

申请日：1997-10-23

申请人： Masaki Suzuki ,  Hiroshi Hashimoto ,  Satoshi Matsubaguchi ,  Hiroaki Takano

发明人： Masaki Suzuki ,  Hiroshi Hashimoto ,  Satoshi Matsubaguchi ,  Hiroaki Takano

IPC分类号： G11B5/70 ,  G11B5/702

CPC分类号： G11B5/70 ,  G11B5/7021 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/256 ,  Y10T428/257 ,  Y10T428/265 ,  Y10T428/31609

摘要： A magnetic recording medium is disclosed, comprising a magnetic layer mainly comprising a ferromagnetic powder and a binder resin formed on at least one side of a non-magnetic support, wherein said magnetic layer has a thickness of from 0.05 .mu.m to 0.8 .mu.m, said ferromagnetic powder has an average long axis length of from 0.05 .mu.m to 0.20 .mu.m, and said binder resin comprises a polyurethane having a radius of gyration from 5 to 25 nm in cyclohexanone.

摘要翻译： 公开了一种磁记录介质，包括主要包括铁磁粉末和形成在非磁性载体的至少一侧上的粘合剂树脂的磁性层，其中所述磁性层的厚度为0.05μm至0.8μm， 所述铁磁粉末的平均长轴长度为0.05μm〜0.20μm，所述粘合剂树脂包含在环己酮中具有5〜25nm的回转半径的聚氨酯。

公开(公告)号：US5804283A

公开(公告)日：1998-09-08

申请号：US968860

申请日：1997-11-05

申请人： Hiroo Inaba ,  Masaki Suzuki ,  Naoto Abe ,  Toshiyuki Kitahara ,  Satoshi Matsubaguchi ,  Hiroaki Takano

发明人： Hiroo Inaba ,  Masaki Suzuki ,  Naoto Abe ,  Toshiyuki Kitahara ,  Satoshi Matsubaguchi ,  Hiroaki Takano

IPC分类号： G11B5/70 ,  G11B5/702 ,  G11B5/738 ,  G11B5/68

CPC分类号： G11B5/70 ,  G11B5/7022 ,  G11B5/738 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/31609

摘要： A magnetic recording medium prepared by a process which comprises providing a nonmagnetic layer comprising a nonmagnetic powder and a binder on a nonmagnetic support, and then providing one or more magnetic layers containing at least a ferromagnetic powder and a binder on the nonmagnetic layer while the nonmagnetic layer is wet, wherein the thickness of the magnetic layer is from 0.07 to 0.20 .mu.m, the magnetic layer comprises a resin curable by a polyisocyanate as a binder, the nonmagnetic layer is a layer cured by a polyisocyanate, and the ratio N/Fe in the magnetic layer is from 0.010 to 0.090 as determined by an X-ray photoelectric spectrophotometer; and a magnetic recording medium comprising a nonmagnetic support having thereon a lower nonmagnetic layer comprising a nonmagnetic powder and a binder, and further thereon a magnetic layer comprising at least a ferromagnetic metal powder and a binder, wherein the magnetic layer has a thickness of from 0.07 to 0.20 .mu.m, the magnetic layer has a maximum magnetic flux density Bm of from 3,700 to 6,000 G as measured in an external magnetic field of 10 kOe, the magnetic layer has a coercive force Hc of from 2,000 to 3,000 Oe, the magnetic layer has a center line surface roughness Ra of from 1.0 to 3.0 nm, and the nonmagnetic support has a center line surface roughness of from 0.5 to 7.0 nm on the side thereof to which the lower non layer is provided.

摘要翻译： 一种磁记录介质，其制备方法包括在非磁性载体上提供包含非磁性粉末和粘合剂的非磁性层，然后在非磁性层上提供至少含有铁磁性粉末和粘结剂的一个或多个磁性层，而非磁性 层是湿的，其中磁性层的厚度为0.07至0.20μm，磁性层包含可通过多异氰酸酯作为粘合剂固化的树脂，非磁性层是由多异氰酸酯固化的层，N / Fe 在磁性层中，由X射线光电分光光度计测定为0.010〜0.090; 以及包含非磁性载体的磁记录介质，其上具有包含非磁性粉末和粘合剂的下部非磁性层，并且还包括至少包含强磁性金属粉末和粘结剂的磁性层，其中所述磁性层的厚度为0.07 至0.20μm，磁性层的磁通密度Bm为10kOe的外部磁场中测定的3,700〜6,000G，磁性层的矫顽力Hc为2000〜3000Oe，磁性层 具有1.0至3.0nm的中心线表面粗糙度Ra，并且非磁性载体在其设置较低非层的一侧具有0.5至7.0nm的中心线表面粗糙度。

公开(公告)号：US06395400B1

公开(公告)日：2002-05-28

申请号：US09351325

申请日：1999-07-12

申请人： Hiroo Inaba ,  Masaki Suzuki ,  Hiroaki Takano ,  Masatoshi Takahashi

发明人： Hiroo Inaba ,  Masaki Suzuki ,  Hiroaki Takano ,  Masatoshi Takahashi

IPC分类号： B32B2708

CPC分类号： G11B5/7305 ,  B32B27/20 ,  B32B27/34 ,  Y10S428/90 ,  Y10T428/31728 ,  Y10T428/31765

摘要： A magnetic recording medium using a biaxially oriented aromatic polyamide film as a nonmagnetic support resulting in hardly any improper windings or edge damages. The magnetic recording medium includes a magnetic layer containing ferromagnetic powders dispersed in a binder formed on the nonmagnetic support, wherein the biaxially oriented aromatic support has a ratio of the loss tangent at a temperature of 40° C. to the loss tangent at a temperature of 100° C. of 0.7 or higher.

摘要翻译： 使用双轴取向芳族聚酰胺薄膜作为非磁性载体的磁记录介质几乎不产生任何不正确的绕组或边缘损坏。 该磁记录介质包括含有分散在形成在非磁性载体上的粘合剂中的铁磁性粉末的磁性层，其中双轴取向芳族载体在40℃温度下的损耗角正切与在 100℃为0.7以上。

公开(公告)号：US6074724A

公开(公告)日：2000-06-13

申请号：US918864

申请日：1997-08-26

申请人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

发明人： Hiroo Inaba ,  Kiyomi Ejiri ,  Masaki Suzuki ,  Koji Naoe ,  Yuichiro Murayama ,  Hiroaki Takano

IPC分类号： G11B5/702 ,  G11B5/706

CPC分类号： B82Y15/00 ,  G11B5/7021 ,  G11B5/7022 ,  G11B5/70621 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed, which comprises a support having thereon a magnetic layer comprising a binder and a ferromagnetic powder dispersed therein, wherein said binder comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage, and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG.; and further a magnetic recording medium is disclosed, comprising a support having thereon in succession an undercoat layer comprising a binder U and an inorganic powder dispersed therein and a magnetic layer comprising a binder M and a ferromagnetic powder dispersed therein, wherein at least either of the binder U or M comprises a polyurethane resin having at least one cyclic hydrocarbon group and at least one ether linkage and said ferromagnetic powder is a ferromagnetic metallic powder which comprises Fe and has a mean major-axis length of from 0.05 to 0.19 .mu.m and a crystallite size of from 100 to 230 .ANG..

摘要翻译： 公开了一种磁记录介质，其包括其上具有包含粘合剂和分散在其中的铁磁粉末的磁性层的载体，其中所述粘合剂包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性 粉末是含铁的铁磁性金属粉末，其平均长轴长度为0.05至0.19μm，微晶尺寸为100至230安培; 并且还公开了一种磁记录介质，包括其上连续地具有包含粘合剂U和分散在其中的无机粉末的底涂层的支撑体和包含粘合剂M和分散在其中的铁磁性粉末的磁性层，其中， 粘合剂U或M包含具有至少一个环状烃基和至少一个醚键的聚氨酯树脂，并且所述铁磁性粉末是包含Fe并且具有0.05至0.19μm的平均长轴长度的铁磁性金属粉末，以及 微晶尺寸为100至230安培。

公开(公告)号：US5922454A

公开(公告)日：1999-07-13

申请号：US862262

申请日：1997-05-23

申请人： Hiroo Inaba ,  Masaki Suzuki ,  Satoshi Matsubagichi ,  Hiroaki Takano

发明人： Hiroo Inaba ,  Masaki Suzuki ,  Satoshi Matsubagichi ,  Hiroaki Takano

IPC分类号： G11B5/70 ,  G11B5/716 ,  G11B5/738 ,  G11B5/706

CPC分类号： G11B5/716 ,  G11B5/70 ,  G11B5/738 ,  Y10T428/257 ,  Y10T428/258 ,  Y10T428/265

摘要： A magnetic recording medium is disclosed, comprising a lower coating layer mainly comprising an inorganic powder and a binder provided on a non-magnetic support, and one or more magnetic layers comprising at least a ferromagnetic metal powder and a binder provided on the lower coating layer, wherein the thickness of said magnetic layers is from 0.05 .mu.m to 0.8 .mu.m and the magnetic particle incorporated in said magnetic layers comprises Fe as a main component, Co in an amount of from 10 atm-% to 40 atm-% and Y is an amount of from 1.5 atm-% to 10 atm-%, based on Fe.

摘要翻译： 公开了一种磁记录介质，包括主要包含无机粉末和设置在非磁性载体上的粘合剂的下涂层和至少包含强磁性金属粉末和粘合剂的一个或多个磁性层，所述磁性层设置在下涂层 其中所述磁性层的厚度为0.05μm至0.8μm，并且所述磁性层中包含的磁性颗粒包含Fe作为主要成分，Co的量为10atm％至40atm％，Y为 以Fe为基准，其含量为1.5atm％至10atm％。

公开(公告)号：US06630256B2

公开(公告)日：2003-10-07

申请号：US09919405

申请日：2001-07-31

申请人： Masaki Suzuki ,  Toshihiko Miura ,  Masatoshi Takahashi ,  Hiroaki Takano

发明人： Masaki Suzuki ,  Toshihiko Miura ,  Masatoshi Takahashi ,  Hiroaki Takano

IPC分类号： B32B516

CPC分类号： G11B5/733

摘要： Provided is a magnetic recording medium with a total thickness equal to or less than 8 &mgr;m having good electromagnetic characteristics and good repeat running durability in which the dropping of powder onto the running path and tape edge deformation are prevented and a magnetic recording medium with a total thickness equal to or less than 8 &mgr;m having good electromagnetic characteristics, good repeat running durability, and good dimensional stability. A magnetic recording medium having on one surface of a nonmagnetic support a lower layer comprising an inorganic powder and a binder and an upper magnetic layer comprising a ferromagnetic powder and a binder in that order, and having on the other surface thereof a backcoat layer, wherein: said nonmagnetic support comprises inorganic powder particles with a mean primary particle diameter in a range of from 40 to 200 nm; the number of particles of said inorganic powder in the cross-section of said nonmagnetic support is in a range of from 10 to 200/100 &mgr;m2, said nonmagnetic support exhibits a coercivity in a range of from 159 to 239 kA/m; and the overall thickness is equal to or less than 8 &mgr;m. A magnetic recording medium having on one surface of a nonmagnetic support a lower layer comprising an inorganic powder and a binder and an upper magnetic layer comprising a ferromagnetic powder and a binder in that order, and having on the other surface thereof a backcoat layer, wherein: said nonmagnetic support comprises inorganic powder particles with a mean primary particle diameter in a range of from 10 to 200 nm; the number of particles of said inorganic powder in the cross-section of said nonmagnetic support is in the range of from 10 to 200/100 &mgr;m2, the amount of curl d in the direction of width of said magnetic recording medium is equal to or higher than 0.4 mm and equal to or less than 1.0 mm in the direction of protrusion of the magnetic layer at a width of 6.35 mm; and the overall thickness is equal to or less than 8 &mgr;m.

公开(公告)号：US06579592B1

公开(公告)日：2003-06-17

申请号：US09324754

申请日：1999-06-03

申请人： Satoshi Matsubaguchi ,  Masaki Suzuki ,  Hiroaki Doushita ,  Hiroaki Takano ,  Hiroo Inaba ,  Kiyomi Ejiri

发明人： Satoshi Matsubaguchi ,  Masaki Suzuki ,  Hiroaki Doushita ,  Hiroaki Takano ,  Hiroo Inaba ,  Kiyomi Ejiri

IPC分类号： G11B5702

CPC分类号： G11B5/70621 ,  G11B5/70 ,  Y10T428/24355 ,  Y10T428/25 ,  Y10T428/26 ,  Y10T428/2982 ,  Y10T428/31609 ,  Y10T428/31935

摘要： A magnetic recording tape is described, which comprises a plastic support having provided thereon a magnetic layer comprising a ferromagnetic metal powder dispersed in a binder, wherein the magnetic layer has the product P of the coercivity Hc (Oe) in the in-plane machine direction of the tape and the magnetic flux &phgr;m (G·cm) of from 100 to 160.

摘要翻译： 描述了一种磁记录带，其包括在其上设置有包含分散在粘合剂中的强磁性金属粉末的磁性层的塑料支撑体，其中磁性层具有在平面机器方向上的矫顽力Hc（Oe）的乘积P 的磁带和磁通量（G.cm）为100至160。